Property, Equipment and Technology, Net - Schedule of Property, Equipment and Technology, Net (Detail) - USD ($) $ in Millions	Sep. 30, 2024	Sep. 30, 2023
Property, Plant and Equipment [Line Items]
Total property, equipment and technology	$ 9,297	$ 8,780
Accumulated depreciation and amortization	(5,473)	(5,355)
Property, equipment and technology, net	3,824	3,425
Land
Property, Plant and Equipment [Line Items]
Total property, equipment and technology	72	71
Buildings and building improvements
Property, Plant and Equipment [Line Items]
Total property, equipment and technology	1,042	1,022
Furniture, equipment and leasehold improvements
Property, Plant and Equipment [Line Items]
Total property, equipment and technology	2,301	2,146
Construction-in-progress
Property, Plant and Equipment [Line Items]
Total property, equipment and technology	222	344
Technology
Property, Plant and Equipment [Line Items]
Total property, equipment and technology	$ 5,660	$ 5,197